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clarified light source grammar in documentation (suggested by William Newman)

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Wenzel Jakob 2014-02-06 15:37:56 +01:00
parent 093050f755
commit 24abf59c4b
2 changed files with 25 additions and 1 deletions
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1
doc/main.tex
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@ -109,7 +109,6 @@
captionpos = b, captionpos = b,
upquote = true, upquote = true,
literate={*}{{\char42}}1 literate={*}{{\char42}}1
{-}{{\char45}}1
{\ }{{\copyablespace}}1 {\ }{{\copyablespace}}1
} }

25
doc/section_emitters.tex
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@ -13,3 +13,28 @@ types is shown below:
The arrows indicate the directional distribution of light. The arrows indicate the directional distribution of light.
} }
\end{figure} \end{figure}
\newpage
Generally, light sources are specified as children of the \code{<scene>} element; for instance,
the following snippet instantiates a point light emitter that illuminates a sphere.
\begin{xml}
<scene version="0.4.0">
<emitter type="point">
<spectrum name="intensity" value="1"/>
<point name="position" x="0" y="0" z="-2"/>
</emitter>
<shape type="sphere"/>
</scene>
\end{xml}
An exception to this are \emph{area lights}, which turn a geometric object into a light source.
These are specified as children of the corresponding \code{<shape>} element.
\begin{xml}
<scene version="0.4.0">
<shape type="sphere">
<emitter type="area">
<spectrum name="radiance" value="1"/>
</emitter>
</shape>
</scene>
\end{xml}
Note the parameter names used to specify the light source power, which reflect
the different associated physical units.